1// Copyright (c) 2013 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CHROME_BROWSER_PROCESS_SINGLETON_STARTUP_LOCK_H_
6#define CHROME_BROWSER_PROCESS_SINGLETON_STARTUP_LOCK_H_
7
8#include <set>
9#include <utility>
10#include <vector>
11
12#include "base/basictypes.h"
13#include "base/command_line.h"
14#include "base/files/file_path.h"
15#include "base/threading/non_thread_safe.h"
16#include "chrome/browser/process_singleton.h"
17
18// Provides a ProcessSingleton::NotificationCallback that can queue up
19// command-line invocations during startup and execute them when startup
20// completes.
21//
22// The object starts in a locked state. |Unlock()| must be called
23// when the process is prepared to handle command-line invocations.
24//
25// Once unlocked, notifications are forwarded to a wrapped NotificationCallback.
26class ProcessSingletonStartupLock : public base::NonThreadSafe {
27 public:
28  explicit ProcessSingletonStartupLock(
29      const ProcessSingleton::NotificationCallback& original_callback);
30  ~ProcessSingletonStartupLock();
31
32  // Returns the ProcessSingleton::NotificationCallback.
33  // The callback is only valid during the lifetime of the
34  // ProcessSingletonStartupLock instance.
35  ProcessSingleton::NotificationCallback AsNotificationCallback();
36
37  // Executes previously queued command-line invocations and allows future
38  // invocations to be executed immediately.
39  void Unlock();
40
41  bool locked() { return locked_; }
42
43 private:
44  typedef std::pair<base::CommandLine::StringVector, base::FilePath>
45      DelayedStartupMessage;
46
47  bool NotificationCallbackImpl(const base::CommandLine& command_line,
48                                const base::FilePath& current_directory);
49
50  bool locked_;
51  std::vector<DelayedStartupMessage> saved_startup_messages_;
52  ProcessSingleton::NotificationCallback original_callback_;
53
54  DISALLOW_COPY_AND_ASSIGN(ProcessSingletonStartupLock);
55};
56
57#endif  // CHROME_BROWSER_PROCESS_SINGLETON_STARTUP_LOCK_H_
58